Folsom Lake Crossing. If you took any photos please post them in the comments. Folsom Lake. D r. The Posted Order with map of the closure area can be found here. There is no trail access or alternate route within Folsom Lake State Recreation Area. folsom lake trails map. Success at our Poker Ride! Thank you to everyone who attended. . F ra n c is c o. East Natoma St. Green Valley Rd. State Recreation Area. Main Body. P a rk w a y. Trail Map. S o p h ia.